Study on the in-situ stress Measurement and Distribution Law in the Li Lou Mining Area

Abstract

Li Lou Iron Mine was the most productive underground mining iron mine in China. Up to now, no original rock stress measurement had been carried out. In order to understand the distribution characteristics and variation law of in-situ stress in mining area, a digital hollow inclusion strain gauge based on double temperature compensation was used to measure 7 measuring points at 3 levels, and three-dimensional in-situ stress data of 7 measuring points were obtained. According to the measured results, the average ratio of horizontal stress to vertical stress was 2.36, and the main stress field in Li Lou mining area was horizontal tectonic stress. The direction of maximum principal stress was NNE-SSE, in which the north was near NE and the south was near SE, which was basically parallel to the strike of fault structure in the mining area. The maximum horizontal principal stress, the minimum horizontal principal stress and the vertical principal stress changed linearly with the increase of depth.